Drilling apparatus



Nov. 26, 1929. H MERCER 1,737,508

DRILLING APPARATUS Filed April e, 1927 9 sheets-sheet 1 'Wax orizqy.

Nov. 26, 1929. H. H. MERCER 1,737,508

DRILLING APPARATUS Filed April 6, 1927 9 Sheets-Sheet 2 125i/ vroma .61- Ja. JJ@ ,y fag Nov. 26, 1929. H. H. MERCER DRILLING APPARATUS Filed April 6, 1927 9 Shpets-Sheet 4 Nov. 26, 1929. H. H. MERCER 1,737,50 8

DRILLING APPARATUS 9 sheet-sheet 5 Filed April 6, 1927 Nov. 26, 1929.

H. H. MERCER 1,737,508

DRILLING APPARATUS Filed April 6, 1927 NOV. 26, 1929. H MERCER 1,737,508

DRILLING APPARATUS Filed April 6, 1927 9 Sheets-Sheet 7 65 4 a y 64 12%? a y L/? 167/ 0 M Wvk? JM 15J /I Jg/ 63 35 1% 3555 ffy/4 zw aeg e30 A #4 7' ./J

N0V 26, 1929- H. H. MERCER 1,737,508

DRILLING APPARATUS I Filed April 6, 1927 9 Sheets-Sheet 8 worzw,

Nov. 26, 1929. H. H. MERCER 1, 137508 DRILLING APPARATUS Filed April 6, 1927 9 Sheets-Slieet 9 Patented Nov. 26, 1929 UNI-ran'- STATES PArENrjol-ricr HENREH. MERCER, oE-cLAaEmoNr, NEW AssreNoa 'ro suriLrvAN MACHINERY comm, A conrom'rron or MAssAcirUsErTs .'l

:inname ArrAEArus Applicationvled April 6*., 1927. Serial No. 181,585..A

This invention relates to drilling apparatus and more particularly, but not exclusively, to adrilling apparatus ofthe portable gasoline driven impact type.

proved portable self-'contained drilling appa-5 ratus especially adapted for drilling relatively large holes of moderate de th in friable or tough materials. A still rther object is to provide an improved drilling apparatus of therotary impact type havingv improved and simplified mechanism for reciprocating and rotating the cutting tool. A

further object isV to provide improved mechanism for enabling the apparatus to ream or enlarge holes with facility, the drill rods being held againstreciprocation during this operation. ltill another Objectis to provide anl improved drilling apparatus having im-A proved mechanism for hoisting the drill rods. Further objects of this invention are to provide an improveddrilling apparatus opervative to automatically provide itsoWn supply of hole cleansing fluid. and to provide an improved, feeding mechanism for the. drilling tool. A still further object is to provide improved means forinit-ially guiding the drill rods upon starting of a hole. Still another object is to provide an improved standard mounted upona tractor or motor 'drivenbase which has the usual type of tracklaying treads for supportin the drill and for propelling the same.l et another object is to provide an improved supporting'means for the improvedcombined.hole cleansing Huid generating means and steel reciprocating means. A further` object is to provide an improved plural speed mechanism for rotating the drill rods. A still further object is to provide an limproved mechanism for moving the drilling engine relative to the supporting base 'and away fromv the drill hole during hoisting ofthe drill rods. These and other objects and advantages of this invention will, however,v hereinafter more fully appear.

The invention is exemplified in the novel 5 combination of elements and details of con- 5 An object of this invention. is to provide sectional view taken on line 9 9 of Figs. 5

struction hereinafter more fully described and more clearly brought out in the appended claims.

-In the accompanying drawings there is shown for purposes of illustrationone form and several modications thereofwhich the invention may assume in practice.

' In thesev drawings,- F ig.1 is a plan view of the improved drilling apparatus. Y l

- Fig. 2 is an end'elevati'on of the improved drilling apparatus shown'in Fig. 1.V

Fig. 3'is a side elevational view of the drilling apparatus shown in Fig. v1, parts being broken away to facilitate illustration. I Fig. 4 is 'an enlarged side elevational view lllustrating the drilling engine per se and supporting standards therefor, parts being shown in section to illustrate details Yof construction. v

Fig. 5 is a front elevationalview of the mechanism shown in Fig.'4.

Fig. 6 is an enlarged central longitudinally extending vertical sectional view taken substantially on line 6-6 of Fig. 4 andvillustrating the drilling engine and aportion of the improved plural speedrotation mechanism for the drill ro A Fig. 7 is an lenlarged transverse horizontal sectionall View. taken' on line 7-7 of Figs. 3 and 8. A

Fig. 8 is a vertical sectional view taken on line 8-8 of- Figs.` 2 and 7.

Fig. 9 is a transverse horizontal detail and Gand illustrating a portion of .the improved plural speed rotation mechanisml for the drill rod.

Fig. 10 is a fragmentary transverse horizontal sectional view taken on line 10-10 of Fig. 2 illustrating the improvedmeans for moving the drill guiding frame relative to the base frame.

. Fig. 11 is a detail sectional view. taken on line 11-11 ofFig. 10 with parts omitted.

Fig. 12 is a detail sectional view taken on line 12--12 of Fig.v 8 through the hoisting drum and the driving and controlling mechanismtherefor. Y

Fig. 13 is a fragmentary end elevational view taken'on line 13-13 of Fig. 12.

Fig. 14 vis a transverse vertical sectional view taken on line 14-14 of Fig. 12. y

Fig. 15 is a detail horizontal sectional view taken on line 15-15 of Fig. 13.

Fig. 16 is a detail sectional view illustrating the reversible ratchet mechanism for moving the drilling engine relative to the supporting base, the view being taken on line 16-16 of Fig. 10.

Fig. 17 is a detail sectional view illustrating the hoisting drum control handle and lock therefor. l

Fig. 18 is a detailed sectional view illustrat- 4ing a portion of the feeding mechanism and the sliding frame structure. p

Fig. 19 is a detail transverse horizontal sectional view taken on line 19-19 of Fi 18 and illustrating the adjusting and loc ing mechanism for the feed nuts.

Fig. 20 is a vertical sectional view taken on line 20-20 of Fig.'7.

Fig. 21 is a detail view illustrating the device for preventing entry of dust orother foreign substances into the moving parts of the chuck mechanism.

Fig. 22 is adetail sectional view taken on line 22-22 of Fig. 23, with parts omitted.

Fig. 23 is an enlarged detail sectional View` of a portion of the mechanism for holding the drill rod against reciprocationvand details of the drill rod chuck structure.

Fig. 24 is a detail view of the improved nut locking means for securing the piston rod to the drill rod chuck.

Fig. 25 is a detail sectional view taken on line 25-25 ofFig. 3.

Figs. 26, 27 and 28 are detail sectional views illustrating the improved guiding means for the drill rod during starting of the hole.

Figs. 29 and 30 are detailviews illustrating the tightening means for the driving belt.

Fig. 31 is a view similar to that shown in Fig. 6 and illustrating a modified form of construction. Y

Figs. 32 and 33 are' detail views illustrating a modified form of guiding meansl for the drill rod during starting ofva hole.

In this illustrative embodiment of the invention vthereis shown a tractor generally designated 1 comprising a frame 2 suitably supported on side supporting frames 3 of endless tracklaying treads 4, the frames 3 each carrying a series of flanged rollers 5 cooperating with the treads 4 for supporting tne apparatus. Suitably carried at the opposite ends of the tread frames 3 are sprockets 6 and 7 cooperating with the tracklaying treads 4, the sprockets 6 being idler sprockets while the sprockets 7 are driving sprockets. As shown, the frame 2 comprises laterally spaced horizontal bottom plates 8 supported at their rear ends on a during the drilling the side members projecting forwardly beyond the member 11. It will herein be noted that the side members 10 each carry a jack screw 13, or other suitable device, which' are adapted to engage the front axle, 12 in such amanner as to steady the apparatus operation. 'As shown in Fig. 1 the forwar ends of the side members 10 are rigidly connected by a transverse frame member 14. Supported on the transverse frame member 14 and the side members 10 intermediate the latter is a tractor dri-ving` engine l5 of'the well known Fordson type having a usual plural speed transmission 'housing 16 and differential housing 17. Connected to the 'differential within the housing 17 in the usual manner are horizontal alined axles 18 and 19 disposed transversely of the supporting frame and journaied at their outer ends in bearings 20 carried by supplemental side members 21 disposed parallel with the side members 10 and suitably rigidly secured to the horizontal lates 8 of the supporting frame 2. Suitab y secured to the outer ends of the axles 18 and 19 are suitable chain sprockets 22 which are connected through endless chain connections 23,to drive sprockets 24 suitably connected vto the chain sprockets 7 for driving the tracklaying .treads 4. Each of the axles 18, 19 has suitably secured thereto a usual brake drum 25 with which a brake band 26 cooperats', each of the brake bands having suitable controlling mechanism including a 'controlling lever 27. It is accordingly evident -of one of the tracklaying treads in such a manner as to permit the other tread to drive the drilling apparatus in a curved path, thereby permitting turning of the apparatus in one direction or the other as desired. Improved means is provided for actuating the usual friction clutch pedal 28 of the Fordson power unit and this mechanism includes a hollow actuating rod 29 extending rearwardly longitudinally of the apparatus and carrying a hand wheel 30, the latter being driving pulley 32 projecting laterally fromthe -side of the same and this pulley is adapted to drive the drilling engine and the feeding and hoisting mechanisms in a manner tobe later described. The pulley 32 may be connected to or disconnected from the engine drive shaft at will and is at all times under control of the engine clutch.

-In the improved construction it will be observed that secured to the horizontal bottom plates S are parallel guide members V33 extending longitudinally of the supporting frame (see Figs.' 2, 10 and 11). Slidably mounted on the supporting frame 2 is a base casting 34 having lateral guiding edges 35 slidably engaging the guideways 33. The base casting 34 has formed thereon upstanding split clamping portions 36 having vertical bores 37 which receive the lower ends of a plurality of, herein four, parallel vertically disposed hollow rods or tubular guiding members 38, these members cooperating to form a vertical standard upon which the drilling engine is guided. As shown in F igs. 2, 7 and 8, the upper ends of the guide rods 38 are held in rigid spaced relation by means of a top casting 39 having depending bored clamping portions 40 within which the rods are clamped in position. lPivotally connected at 41 to the top casting 39 arebracing rods 42 eachconnected by a slot and bolt connection 43 to the forward endsof the side members 10. Referring to Figs. 5, 10.and 11 it will be observed that the slidable base casting 34 is provided with a central longitudinallyextending slot or opening 44 extending throughout a portion of its length and this slot is adapted to receive improved guiding means for the drill rod as will hereinafter be described. v

As illustrated, improved means are provided for moving the base casting 34 and the drill supporting standard thereon relative to the supporting frame 2 of the tractor and thisr A means herein comprises a rack 45 secured by bolts 46 to the base casting 34 at the longitudinal center thereof. Meshing with the teeth of this rack is a spur pinion 47 ixed to a horizontal shaft 48 disposed below the horizontal plates 8 and extending transversely of the supporting frame 2. The shaft 48 is suitably journaled in bearings49. secured to and depending from the bottom plates 8 and has secured thereto at its outer enda ratchet wheel 50. Cooperating with the ratchet Y wheel 50 is a reversible pawl 51 pivotally mounted at 52 on Va lever 53, the latter in turn being pivotally mounted for swinging movement on the shaft 48. The reversible trolling or locking latch 57. When it is desired to shift the base `frame supporting the pawl 51 has herein formed integral therewith4 an upstanding arm 54 connected through a link 55 to a coiled spring 56 disposed within the hollow arm of the lever 53. The outer end Y of the spring 56 is connected to a suitable condrill standard relative to the supportingframe 2 the operator first loosens the bolt connections 43 of the brace rods 42 and then grasps the lever 53 and swings the latter back and forth, causing the pawl 51 to rotate the ratchet wheel 50. Consequently vthe shaft 48 and the pinion 47 are rotated and due to the meshing engagement of the latter with the .rack 45 the base casting is moved longitudinally within the guideways 33. When it is desired to shift the drill standard in the opposite direction the operator suitably manipulates the latch 57, thereby swinging-the position relative to the ratchet wheel and upon continued swinging movement of the shown in Fig. 11 to the full line position or vice versa expeditiously and with facility.

.. In accordance with this illustrative em-v bodiment of the invention thevertical rods or standards 38 have mounted thereon for pawl 51 .about its pivot 52 and reversing its d,

vertical movementfrelative thereto a sliding frame60 which has housed therein the drilling engine proper which is herein substantially the same as that described in my copending application Ser. No. 742,337, led October 8,' I I tie rods 64.-` As shown in Fig. 6V the upper head 61 carries suitable roller bearings 65 within which a crank shaft 66 is journaled. Suitably secured to one end of the crank shaft' 66 is a balancing wheel 67, while journaled on a bearing sleeve 68 supported on the opposite end of the crank shaft is a combined driving pulley and tly Wheel 69. Secured by bolts 70 to the driving pulley 69 is an internal gear clutch member' 71 While keyedto the crank shaft at 72 is a spur gear 73. Slidably mounted on the gear 73 and having teeth intermeshing with the teeth of the gear is la gear clutch member 74 having ez'zternal gear teeth adapted to cooperate with the teeth on the internal gear 71.- As shown, cooperating with the shipper gear 74 is a shipper yoke 75 carried by a vertically disposed shipper rod 76 suitably guided at 77 on the sliding frame 60. Asshown in Fig. 25 the rod 76 has secured per gear 74 either inwardly or outwardly to connect or disconnect' the driving pulley k69 to or from the crank shaft 66. Supported on the sliding frame 60 is a combined tool reciprocating and pumping means which is substantially similar to that described in my copending application mentioned above and also in my copending application Ser. No. 47 2,546, tiled May 25, 1921. This means comprises concentric cylinders 85 and 86 clearly shown in Fig. 6, upper and lower heads 87 and 88, and a second upper head 89. The cylinder structure is positively reciproeated relative to the frame 60 and suitably slidably supported thereon by mechanism hereinafter described. As shown, a piston 90 is reciprocably mounted in the cylinder 86 and carries a hollow depending piston rod 91 connected at its lower end.in a manner to be later described to an improved chuck mechanism 92 to which is secured the hollow tool carrying drill rods 93. Extending upwardly from the piston 90 is a fluid conducting tube 94, which may be a continuation of the piston rod 91, adapted to receive pressure fluid from an interna-l chamber 95 formed between the heads 87 and 89 and fluid is supplied to this chamber from the cylinder 86 through the space between the concentric cylinders 85 and 86. Suitable valve mechanism 96 is provided for allowing pressure to build up within the chamber while flow of fluid to the opposite ends of the cylinder' is through suitable valve mechanisms 96a. .The valves of these valve mechanisms are of the ordinary finger type controlling suitable ports. The second upper cylinder' head 89 has preferably formed-integral therewith spaced perforated supports 97 and 98 disposed on each side of a central upstanding boss 99. Disposed within the sup# ports 97 and 98 are horizontal wrist pins 100 to which the lower end of a yoke shaped or bifurcated connecting rod 101 is connected, *the upper end of the connecting rod being connected at 102 tothe crank shaft 66. As

clearly shown in Fig. 6 the tubular rod 94 is imperforate but openat the top and as the piston 90 moves relative to the cylinder the rod 94 is adapted to reciprocate within a sleeve 103, which sleeve surrounds the rod 94 6o 'and is provided with a series of longitudinal openings or slots 104 extending therethrough. Surrounding the sleeve 103 is a second sleeve 105 likewise perforated by a series of longitudinal openings or slots 106 which register with the slots 104. The 4sleeve 105 is threadedly connected at 107 within the central boss 99 on the upper cylinder head 89. A suitable gland 108 is carried by the sleeve 105 and this gland prevents leakage of pressure fluid from within the cylinder past the tubular rod 94 in an obvious manner. It will be noted that the outer sleeve 105 projects beyond the top of the cylinder head and that it is threadedly engaged by an adjustable closure member or cap 109, suitably clamping means 110 being provided for fixing the closure member tothe sleeve 105. As shown, carried by the closure member 109 and threadedly engaging the inner sleeve 103 is a bolt 111 which is adapted to adjust the sleeve 103 longitudinally to coml press the packing of the gland 108. The lower cylinder head 88 carries a usual stufliug box 112 which prevents leakage of pressure Huid from the lower end of the cylinder past the piston rod 91. Improved means is provided for slidably supporting the drill reciprocating and pump cylinder during positive reciprocation thereof and is -herein shown as comprising bearing supporting members 113 and 114 (see Figs. 4, 5 and 6) disposed at diametrically Vopposite points of the cylinder structure and each comprising a rectangular shaped frame 115 carrying cylindrically recessed bearing receiving portions 116 on the vertical sides thereof. The

frames 115 are each disposed betweena pair of the rods 64 which maintain the sliding frames 61 and 62 in rigid spaced relation. The bearing surfaces 116 slidably engage these spacing rods 64 in-a manner clearly described in my copending application Ser. No. 742,337 mentioned above. Thus the cylinder will have a definite slidable relation with respect to the sliding frame 60 due to the fixed relation of the tie rods 64 to the upper and lower heads 61 and 62. As the sliding frame and drilling engine structure are clearly described in the copending applications mentioned above further detailed description is herein deemed unnecessary. In the operation ofthe' drill reciprocating and pumping cylinder thus far described, rotation of the crank shaft 66 will positively reciprocate the cylinder and cause pressurev fluid to be pumped from the inner cylinder'to the space between the cylinders, through the inner chamber 95, thence through the open ings 106, 104, and through the hollow piston rod 91 to the bottom of the drill hole.

The improved plural speed `rotation mechanism for the drill rods as shown in the drawings specitically comprises a pulley 120 keyed at 121 to a horizontal shaft 122 disposed transversely of the sliding frame 60 and journaled in ball bearings 123 carried by the lower .frame 62. The shaft 122 has'fixed thereto a spur pinion 124 which meshes with a spur gear 125 keyed at 126 to the hub of a spur pinion 127, the latter being journaled on a bearing sleeve 128 fixed to a horizontal shaft 129 disposed parallel with the shaft 122 and journaled in ball bearings l1,30 likewise carriedby the frane 62. As glearly shown in Fig. 6 the pinion 127 meshes with a larger spur gear 131 keyed at 132 to a horizontal shaft 133 disposed above and parallel with the shaft'129.` The shaft 133 is journaled in ball bearings 134 suitablyJ carried .by the frame 62 and has fixed thereto a spur pinion 135. Splined at 136 is a hub 137 of a spur gear 138, the latter being frictionally connected to the hub 137 by means of a friction plate 139 resiliently held by springs 140 and bolts 141 in contact with inclined surfaces 142v on the hub 137. It'is accordingly evident that when the gear 138 becomes overloaded,

the springs 140 will automatically yield, consequently vpermitting slippage between the hub 137 and the gear. Asillustrated, the gear 138 is adapted to be shifted longitudinally' relative to the shaft 129 by means of a shipper yoke 143 suitably connected to an actuating rod 145 .carrying a suitable grasping handle 146. The actuating rod 145 is adapted to be held in its dierent adjusted positions by means of a spring pressed.

plunger 147 carried by thev frame 62 and engageable with'suitable notches in the rod.

In this instance the gear 138 carries internal is disposed within a bore 158 formed within gear teeth 148 which are adapted to cooperate with the teeth on the spur pinion 127 when the gear 138 is moved to its innermost position. The shaft 129 has keyed thereto at its inner end al bevel pinion 149 which meshes with a larger bevel gear 150 disposed coaxially with the piston rod and cylinders,

The gear 150 is keyed at 151 to a hub portion- 152 Journaled on .inclinedbearing surfaces 153 formed within the lower frame 62. The hub 152 is cent-rally bored and has formed thereon longitudinal splines or keys 154 which cooperate with splineways 155 formed on the external periphery of the chuck 92, the

latterbeing adapted-to reciprocate within the hub 152 during rotation of the gear 150. It will herein be noted that a suitable housing or dust bag 156 (see Fig. 21) is secured tothe lower end ofthe hub 152 and has an opening through which the drill rod 93 extends, and this dust bag prevents the entry of dirt into the moving parts of the chuck mechanism. As shown,'the lower end of the piston rod v91 is enlarged at 157 and this enlarged portion the ch'uck 92. The piston rod is rigidly clamped to the chuck 92 by means of a split or two-part nut 159 threadedly connected at 160 to the chuck and engaging the enlarged portion 157. -A suitable lock nut 161maintains the nut 159 in position. Referring to Figs. 22, 23 and v24'it will be observed that the lock nut 161 has threadedly connected thereto at 162 screws l163 having integral therewith pins 164 which are adapted to cooperate .with vertical openings 165 formed in the chuck member i s illustrated, interposed between the lock nut 161 and the upper surface of the chuck 92 is a yieldable v two-part nut 159. It is accordingly evidentthat when it is desired to tighten the nut 159 the screws 163 are removed and the lock nut 161 Unthreaded. from the top of the nut 159. The annular member 166 is then lifted vertically. It is then possible to tighten the nut by means of a suitable wrench engageable with slots 171 formed on the upper end of-the nut 159. After the nut is tightened the annular member 166 is then slipped downwardly in a position with its teeth 169 interlocking with the teeth 170 on the nut 159 and with the projections 167 thereon inserted within the slots 168- in theI chuck. The locking nut 161 is then lagain threaded onto the upper part of the nut 159 and the yieldable ring 166 is rigidly clamped in position. Thescrews 163 are'then inserted within the locking nut with the 'pins 164 thereon disposed in the openings 165 in the chuck. It is obvious that the nut 159 may be readily adjusted and after such adjustment rigidly locked in position.

It is further obvious that due to the interlocking teeth 169, 17 0 it is possible to obtain the drill rods 93 are rotated at a relatively slow speed. However, when it is desired to rotate the drill Arods at a relatively high speed, for instance when it is desired to ream or enlarge the hole, the operator grasps the handle 146 and slides the gear 138 inwardly,

disconnecting the gear 138 from the pinionv 135 and connecting the internal gear teeth 148 with the teeth on t-he pinion 127. Consequently as the shaft 122 is driven by the pulley 120 the pinion 124 is rotated, thereby driving the gear 125, which is directly connected to the shaft 129, the bevel pinion 149 and the bevel gear 150, thereby rotating the drill rods 93 at a relatively high speed. It is obvious. that when the gear 138 is shifted into its intermediate or neutral position as shown in Fig. 6, rotation of thevdrill rods is discontinued. To permit manual rotation of the bevel gears 149, 150 to rotate the drill rods 93 the outer end of the shaft 129 is squared at l172 tol receive a. suitable wrench -or lever. As shown in 9 the outer end fixed upper portion 180 and a' separate ad-v of the shaft 122 is squared at 173 for asimilar reason. v

The mechanism for feeding the'drilling engine proper upwardly or downwardly within the standards 38 is substantially simi- '.lar to that described in-my copending application Ser. No. '742,337 mentioned above, and 'herein comprises rotatable feed screws 174 suitably journaled at their vlower ends Withthebasecasting 34 and extending substantially throughout the length of two diagonally positioned standards 38 and ro tated by suitable mechanism disposed witho in the top casting 39. Referring more particularly to Fig. 18 it will be noted, that the upper frame 6 1 has mounted immediately below the same .nutcarrying members 17 5, these members being rigidly clamped to the upper frame 61 by means of the tie rods 64',

one nut carrying member being supported by each pair of tie rods. The nut carrying members 175 eachcomprise a vertical web having hollow rod receiving lugs 176 on the oppo- ,site` ends thereof. Projecting outwardly from one of the lugs 176 of each member are arms 177 extending through vertical slots 178 extending substantially throughout the lengthof the two diagonally opposite standards 38, while carried by each of the arms 177 is a plural-part nut 179 adapted to engage the adjacent feed -screw 174. As sho wn in Figs. 18 and 19 the nut 179 comprises a justable lower portion 181, the latter having formed thereon at its lower'end grooves 182 adapted to receive a suitable wrench for ro- I l tating the nut portion 181. The portion 181 is adapted to be locked against rotation by means of a locking clip or dog 183 having teeth 184 adapted to cooperate with external teeth 185 likewise formed on the nut portion 181. The dog 183 is adapted to be held in its engaged position by means of a set screw 186 threadedly connected at 187 to the nut carrying member 175, the .set screw also abutting the hub ofthe nut portion 181. It is therefore obvious that when it is desired to take up any wear of the nut the set screw 186 may be released, thereby releasing the engagement of the dog teeth from the teeth 185. The operator then connects the wrench to the grooves 182 and rotates the nut portion 181 until the upper surface thereof abuts the lower surface of the stationary nut portion 180. The set screw is then again tightened, movingthe dog 183 inwardly interlocking its teeth with the teeth 185, thereby positively securing the nut portion 18-1 against rotation. j

The mechanism for rotating the feed screws l174 comprises a pulley 190 suitably fixed to a horizontal shaft 191 extending transversely of the top casting 39 and journaled there- Rotatably mounted on the shaft 191 adjacent opposite' ends thereof are bevel pinions 193 vwhich .within the top casting 39 and respectively keyed at 199 (see Fig; 20) to the upper ends bf the feed screws 174.` The upper ends of 'the feed screws 174 are journaled in vball bearings 200 carried by an adjustable member 201 threadedly connected at 202 within the clamp portion 40 formed on the top casting 39. Again referring to Figs. 7 and 8 it will be noted that the bevel pinions 193con'- stitute a reversing mechanism and are adapt-v' ed to be alternatively connectedto the shaft4 191 by means of a double friction clutch 203 of a standard construction having a reciprocable shipper member 204 surrounding the shaft 191. The shipper member 204 is adapted to be shifted axially by means of a shipper yoke 205 fixed to a horizontal actuating rod 206 rotatably mounted within bores 207 formed within the detachable top cover 208 of the top casting 39. The rod 206 has fixed.

thereto an actuating member or handle 207al having oppositely projecting lever portions or'arrns 208a to which pull ropes 209 are connected. Th'e shipper member 207 a is adapted to be held in its different adjusted positions by means of a spring pressed plunger 210 carried by the cover 208. Itis accordingly evident that when the. pulley 190 is rotated and one or the .other of the bevel pinions 193 is connected to the shaft 191 by the clutch 203, the bevel gear 194 and the spur gear 195 are rotated, the latter. driving the `gears 198 and consequently the feed screws 174, are simultaneously rotatedin the desired direction. The nuts 179 carriedby the sliding frame 60 and cooperating with the feed screws 174 are then moved axially and consequently the drilling engine is moved'upwardly or downwardlyas desired. Manually operable mechanism is also provided for rotating the feed.

screw and this mechanism comprises a bevel pinion 211 meshing with the bevel gear 194- and fixed to a horizontal shaft 212 which also carries a toothed sprocket 213. Cooperating with this sprocket is an endless actuating chain 214 (see Fig. 2). When it is desired to manually rotate the feed screws 174 to raise 4or lower thev drilling engine, the operator grasps the chain 214 and rotates the sprocket 213, thereby rotating the bevel pinion 211, bevel gear 194, spur gear 195 and gears 198 secured to the feed screws. It will herein be noted that when the feed screws 174 are rotated by power, the sprocket 213 pinion'meshes with a large spur gear 216 rotatably mounted on a bearing-sleeve 217 (see also Fig. 12) surrounding and supported on a horizontal hollow shaft 218 extending transversely 'of the top casting 39 and journaled thereon in bearings 219. Housed within a laterally projecting sleeve or iiange 220 herein formed integral with thespur gear 216 is' a friction clutch 221 of a well known'construction comprising a contractable friction.

band 222 engageable with a friction drum 223. The drum 223 is fixed at 224 to the shaft 218.

As illustrated, slidably mounted on the hub of the spur gear 216 is a clutch applying member 225 having formed thereon cam surfaces 226 which engage a clutch applying lever 227 pivotally mounted at 228 on the spur gear 216. As shown in Fig. 14 the 'lever 227 is fixed to a horizontal shaft 229 having a shoulder 230 which engages a projection or lug 231 formed on one end of the clutch band-222. The other end of the clutch band is adjustably held in position by a set screw '232. Cooperating with the member 225 is a shipper yoke 233 pivotally mounted at 234 on a depending bracket 235 herein formed integral with the top casting 39. rlhe shipper yoke 233 is pro- I vided with oppositely extending lever or arm portions 236 which are connected to suitable pull ropes 237. The shaft 218 has fixed thereto at 238 a hoisting drum 239 on which a hoisting cable 240 is wound, the latter having fixed to its free end a suitable hook 241 (see also Fig. 2). As 'shown in Fig. 8 a guide sheave 242 is mounted on a horizontal shaft 243 arranged parallel with the shaft 218 and this sheave guides the cable 241 as it is wound on or unwound from the 'drum 239. It is obviols that when the operator grasps and pulls downwardly on one of the ropes 237 the clutch applying member 225 is moved inwardly, the cam surfaces 226 forcing the lever 227 upwardly, rotating the shaft 229 and contracting the brake band 222, thereby frictionally connecting the spur gear 216 to the shaft 218 and consequently the drum 239 is rotated tov wind in the cable 240. The member 225 has a shoulder 244 formed thereon which is engageable with a iange formed on an annular member 245 which also engages the outer race" of a ball thrust bearing 246. The inner race of this ball bearing engages a washer 247 secured to the end of a reciprocable rod 248 extending coaxially through the hollow shaft 218. The rod 248 has secured thereto at its opposite end a' transverse member or plate 249 connected at 250 to parallel pins 251 reciprocably mounted within bores formed withln a depending bracket 252 suitably secured to the Aiently maintains the pins 251 in their outernl ost position. The inner ends of the rods or pms 251 abut against a member 255 carrying .friction blocks or shoes 256 and these blocks constitute a brake for the hoisting drum 239. The member 255 is slidably mounted at 257 on the shaft218. As shown in Fig. 12 the brake member255 is held against rotation by means of a pin 2 58 projecting within an opening 259 formed within the member 255 and carried' by the bracket 252. The coiled spring 254' normally maintains the brake shoes 256 in their releasedposition. From the foregoing it will be evident that when the operator shifts the member 225 outwardly the rod 248 is moved outwardly, thereby moving the pins 251 inwardly and causing the conical surfaces of the stationary brake shoes 256 t'o frictionally engage an internal conical sur face formed on the brake drum 239. It is therefore evident that when the brake druln 239 is disconnected from the driving enginepulley 69 and downwardly arounda beltv tightening pulley 262, and then back to the driving pulley 32. The pulleys 32, 261, 190, 120, 69 and 262 are disposedin the same vertical plane. It will herein be noted that pulleys 190, 120 and 32 are within the orbit of the belt 260 and thepulley 69 is outside. Thus since pulleys 69 and 120 are movable simultaneously as the sliding frame 60 upon which they are carried is moved upwardly and downwardly along the standard the belt will at all times be maintained tight. Also when pulley 262 is suitably swung the tension of the belt may be adjusted. vThe improved mounting for the belt tightening pulley 262 comprises (see Figs. 29 and 30) a lever 263 carrying a stub shaft 264 on which the pulley 262 is rotatably mounted. The

vlever 263 is pivotally mounted vcoaxially with the aXle 19 and suitably supported by the bearing bracket 20 carried by the supportlng vframe-2. The lever 263 is herein provided with a radially projecting grasping portion 265. The lever 263 is adapted to be clamped in its various adjusted positions by means ot' a. clamping element`266 supported by a bolt 267 carried by the lever and adapted to cooperate with a stationary quadrant 268 herein preferably formed integral with the bracket 20. Threadedly connected .to the bolt 267 and engaging the clamping element 266 is a nut member 269 having secured thereto a projecting adjusting lever 27.0. It is A pulley may be readily adjusted and thereafter rigidly clamped in its adjusted position.

Improved means are provided for holding the drill rods 93 against reciprocation during rotation thereof. This means specifically comprises split clamps 271 (see Figs. 22 and 23) having internal threads 272 engaging external threads 273 formed on the upper and lower ends of the chuck 92. The inner.

surfaces of the clamping members 271 abut against the end surfaces of the hub 152 of the bevel gear 150. It is th refore obvious that when the clamping el ments 271 vare suitably positioned and tightened the chuck 92 is held against reciprocation, While the drill rods are held in this po 'tron the same may be rotated at either a ow'or a high speed through the plural speed transmission heretofore described. The drill rod is held` in this manner and rapidly rotated during reaming and when enlarging the bottom of the hole. During this reaming operation the cylinders may be reciprocated relative to the then non-reciprocating piston 90 to pump fluid under pressure through the drill rods 93 to blow the cuttings from'the hole. It is also obvious that during this reaming operation the drilling engine may be moved upwardly and downwardly within the standards as desired.

In a mechanism of this type it will be noted from Fig. 6 that when the drilling ot a hole is started the full length of the drill rods is supported by only the chuck mechanism 92l and thus the cutting tool can be easily delected. To prevent any deflection of the tool, improved guiding means is provided which comprises a bracket 2751 (see Figs. 5, 10 and 28) having parallel guideways 276 cooperating with guides 277 formed on the v edges of the slot44 formed within the slidable bottom casting 34. As shown, the

bracket 275 has pivotally mounted thereon at 279 arms 280 (see Fig. 27) which carry at their outer ends guide rolls 281 which are adapted to engage the external periphery of ting against the guide rods 38 of the standard as clearly shown in Fig. 10. The bracket V 275 also carries guide rolls 283 (see Fig. 26) while pivotally mounted coaxially with each of the rolls is a yoke-shaped member 284 carrying a set screw which is engageable with one of the outer guide rods 38. 'Formed on the bracket 275 at the forward en'd thereof is a suitablev grasping handle' 285. When it isl desired to disconnect the drill rod guid- 111g means from the bottom casting after the hole is started the yoke-shaped members' 284 are swung upwardly thereby releasing the set screws from the guide rods 38.- The operator then grasps the handle A285 and slides the bracket 275 outwardly away from the drill rods, the inner rolls 281 swinging outward as the bracket '275 is released. As shown in Figs. 32 and 33 a modied form of drill rod guiding means is provided. This guiding means comprises guiding rolls 286 having conical surfaces engaging the .periphery of the drill rods 93 and these rolls are mounted on levers 287 suitably fixed to horizontal shafts 288 rotatably mounted on a bracket 289 similar to the bracket 275 here- V tofore described and guided on the base casting 34 in a similar'manner. As shown in Fig. 33 the levers 287 herein have formed integral. therewith intermeshing gear segments 290, while one of these gear segments has formedthereon a socket 291 adapted to receive a suitable actuating lever.' The operator holdsthe guide'rolls 286 into engagement with the drillrods by this lever during starting of the hole.- When it is desired to swing the from the drill .rods 93, Aor in other words, from the full line position shown. in-Fig. 33 to the dotted line position, the operator guiding rolls 286 outwardly away inserts the lever within the socket 291 and swings the same, thereby swinging the gear se ents the levers 287 together with the guiding rolls I outwardly. Itis obvious that in this form of the guiding means all necessity of adjusting a plurality of set screws is eliminated, the guiding rolls being swung outwardly by a simple swinging motion.

As shown in Fig. 31a modified form of rotation mechanism is provided for the drill rods 93 and this mechanism comprises a bevel pinion 295 keyed at 296 to the crank shaft 66 heretofore described. The bevel pinion 295 has formed integralwith the hub thereof a spur pinion 297 which meshes with 290 about their pivots and moving a larger spur gear 298 keyed at 299 to the hub of a second bevel pinion 300, the pinion 300 belng rotatably mounted ona horizontal stub shaft 30.1 carried'by theupper frame 62 of the `sliding frame 60. The bevel pinions 295 and 300 rotate in opposite directions and at different speeds. As shown, disposed at eters, the smaller gear 307 being ladapted to,

1 mesh with the bevel pinion 295 while the larger gear 308 is adapted to mesh with the bevel pinion 300. Secured to the shaft 305 which is connectible to the shaft l302 in a manner to be later described is a bevel pinion 309 which meshes with a larger bevel gear 310 disposed coaxially with the drill rods 93 land through-which the chuck mechanism 92 extends. The gear 310 has a hub portion 311 threadedly connected at 312 to a member 313, the bevel gear 310 and the member 313 being rotatably mounted on ball bearings 314 suitably carried by the lower frame 62. The

memberV 313 yhas formedv therein longitudinally extending splines 315 which cooperate with splineways 316formed on the external periphery of the chuck 92 to which the drill rods 93 are connected. It will herein be noted that the gear 310 is composed of two parts frictionally connected together by an automatically releasible friction device 317 which is adapted to slip upon overload, thereby preventing breakage ofthe rotation parts. As illustrated, the shaft 302 is adapted to be moved axially to alternatively connect the bevel gears 307, 308 to their respective drlving pinions and the mechanism for accomplishing this comprises a nut 318 threadedly connected to the shaft at 319 and having formed thereon a hand wheel 320. The nut 318 is also threadedly connected at 321 to the vsleeve 304 formed on the shaft 305, A spring clip 322 carried by the nut is provlded which is adapted to cooperate with notches 323 formed in a locking ring 324 fixed to the shaft 302 and this clip is adapted to lock the nut in its different adjusted positions. It is accordingly evident that when the nut 318 is rotated in one direction or the other relative to the shaft 302 the latter may be moved axially in opposite directions as desired.l I t will also be noted that when the gear 307 1s connected to the bevell pinion 295the shaft 302 may be rotated at a relatively high speed, while when the bevel gear .308 is connected to the bevel pinion 300 the shaft 302 may be rotated at a relatively slower speed. Consequently the drill rods 93 maybe rotated at a plurality of speeds as desired. Mechanism is also provided for manually rotatingthe shaft 302 and which comprises a bevel gear 325 fixed to the shaft 302 and meshing with a bevel gear 326 herein preferably formed integralwith a horizontal shaft 327 journaled on the upper frame ,61. The shaft 327 has fixed thereto a handle 328. As shown, the shaft 327 is circumferentially grooved at 329 and cooperating with this groove is a spring pressedL plunger 330 having an operating handle 331 connected thereto. The shaft 327 is also provided with a locking notch 332 with which the plunger 330 is adapted to cooperate.` When the shaft 327 is in the position shown the gears 325 and 326 are in meshing engagement, and upon rotation of the shaft the shaft 302 and the bevel gears 309, 310 may be rotated, consequently rotatingthe drill rods 93. When it is desired to release engagementfof the gears 325,326 the operator grasps the handle 331 and pulls the plunger downiwardly, disengaging the same from the groove 329. The shaft 327 is then pulled outwardly disconnecting the bevel gears and 'bringing the locking groove l332 in registry with the plunger 330. The handle 331 isthen' released and the plunger locked within the groove 332, thereby holding gear 326 in its inoperative or released position. Suitable detachable clamps 333 cooperate with grooves 334 formed in the chuck 92 and these clamps abut against the upper and lower surfaces of the member 313, consequently holding the chuck against reciprocation during the reaming" operation. However, when it is desired to reciprocate the drill rods these` clamps 333 are detached from the chuck and the latter is permitted to freely reciprocate within the member 313. A

The general mode of operation of the improved drilling apparatus is as follows: The apparatus is' propelled from one working place to another by the tracklaying treads 4 driven by the engine 15 under the control of the brakes 25, 26. The apparatus may be propelled selectively forwardly at a plurality of speeds and atf a reverse speed under the control ofthe usual Fordson transmission and engine clutch. If itis desired to turn the apparatus in one direction or the other one or the other of thebrakes is applied, the machine turning'as is usual in tractors of the type disclosed. When the working place is reached the engine clutch is thrown out and the jack Ascrews 13 carried by the side members 10 are suitably adjusted into engagement with the front axle 12 and the frame of the'apparatus is thereby held rigid. The power pulley 32 is connected to the engine drive shaft and the engine clutch is then thrownl in, causing vthe belt 260 to rotatethe pulleys 69, 120 and 190. 4The drill runner then grasps one of the pull ropes 209 and the friction clutch 203 is applied, thereby connecting the feed screws 174 to the driving engine-and the sliding frame 60 is fed upwardly within the guiding standards 38, the clutch' 203 being thrown out when the sliding framel reaches the limit of its upward travel. The hoisting cable 240 is then suitably connected to the drill rod and the clutch 222 is applied, thereby etl'eeting rotation of the hoisting drum 23S) and causing the latter to wind in the cable,l 240 and the drill rod is hoisted in position and suitably coupled to the chuck mechanism 02. A suitable wrench is connected to the squared portion 172 of the shaft 120 and the chuck is manually rotated to screw the drill rod thereto. This manual rotation is also used for screwing or nnscrewing the drill rod joints. When it is desired to hold a load in suspended position by the hoisting drinn 230 the clutch 222 is disconnecttal and the brake 256 applied, this being accomplished merely by shifting the clutch shipper 225 in a reverse direction. After the drill rod is suitably connected to the chuck and the cutting tool suitably screwed to the lower end ot the drill rod the drill ruimer inserts the ln'acket 175 carrying the guiding rolls 281 and 283 in position within the central slot in the base casting 34, the rolls being suitably positioned relative to the drill rod Sll by means of thc set screws 282 engaging the guiding standards 3U. The operator then grasps the handle 7S) and the crank shaft clutch 7 4 is thrown in. The operator also grasps the handle 140 and connects the gear 138 with the pinion 1235 and consequently connects the drill rod 93 to the slow speed drive. The engine clutch is thereafter connected and the drill cylinder and piston are reciprocated within the slid' the compressed fluid blowing the cuttings from the drill hole as cutting progresses. The cutting tool is slowly rotated during reciprocation thereof. The guiding rolls 281 and 283 steady the drill rods during the starting of the hole and this guiding means is detached from the machine after the hole is started. After reciprocation and rotation of the drill rod has started the operator grasps one of the pull ropes 209 and the friction clutch 203 is applied, connecting the feeding mechanism to the engine and consequently the drilling engine is fed downwardly at the desired speed. As the hole deepens additional rod sections may be added to the rod 93 in an. obvious manner. "When it is desired to hoist the drill rods from the hole the upper drill rod is first disconnected from the chuck 92 and the bolts of the brace rod clamps are loosened. The operator then actuates the lever 53, thereby actuating the ratchet mechanism 50, 51, and the guiding standards together with the drilling engine thereon are moved forwardly relative to the tractor frame andaway from the drill hole. 'lhe hoisting cable 240 is then suitably connected to the drill rods a'nd upon application of the clutch 222 the cable is wound in by the drum 289 and the rods hoisted upwardly in an obvious manner. If it is desired to ream the drill hole the clutch 74 is released disconnecting the drilling engine from the driving pulley 69 and the operator then grasps the handle 140 and -the slow speed rotation is disconnected and the fast speed rotation connected and consequently the drill rods aref rotated at a relatively fast speed. The chuck 02 is held against reciprocation at this time by the clamps 271. During the reaming operation the drilling engine may beraised uiiwardly or fed downwardly within the guiding standards as desired. Asthe drill rods 03 are rotated at a fast speed the cylinder may be reciprocated relative to the then non-reciprocating piston 90 and consequently `fluid under pressure may' be supplied to the bottom of the drill hole to blow out the cuttings. It will be noted that the drill is exceedingly flexible, all parts under load being controlled by suitable frictional devices and furthermore, due to the pneumatic connection between the drilling tool and engine all strain and sudden loads or shocks on the latter are obviated. These and other uses and advantages of the improved drilling apparatus will be clearly apparent to those skilled in this art.

While I have in this application specifically described one form and several modifications thereof which my invention may assume in practice, it will be understood that this form and these modifications thereof are shown for pui-poses of' illustration and that the invention maybe moditied and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a drilling apparatus, a portable base having a power driving element thereon, a guiding standard slid ably mounted thereon, a tool actuating mechanism slidably mounted on said standard operatively connected to said power driving element, and means for sliding said standard relative to said base.-

2. In a drilling apparatus, a portable b-ase, a guiding standard slidably mounted thereon, a tool actuating mechanism slidably mounted on said standard, an engine on said base, driving connections between said engine and said tool actuating mechanism, and means for sliding said standard relative to said base.

3. In a drilling apparatus, a portable base, a guiding standard slidably mounted thereon, a tool actuating mechanism slidably mounted on said standard, an engine on said base, mechanism driven by said engine for feeding said tool actuating mechanism relative to said standard, driving connections between said engine and said tool actuating mechanism, and means -for sliding said standard relative to said base.

4. In a drilling apparatus, a portable base, a guiding' standard mounted thereon, a tool reciprocatinfr mechanism slidably mounted on said standard, an engine on said base, driving connections between said tool reciprocating mechanism and said engine, and mechanism driven by said driving connections for rotating the tool -selectively at a plurality of predetermined speeds in the same direction.

5. In a drilling apparatus, a portable base, a guiding standard mounted thereon, a, tool reciprocating mechanism slidably mounted on said standard, an engine on said base, mechanism for feeding said tool reciprocating mechanism relative to said standard, driving connections between said engine and said vtool reciprocating mechanism and said feeding mechanism, and mechanism driven by said driving connections for rotating .the tool selectively at a plurality of predetermined speeds in the same direction.

6. In a drilling apparatus, a portable base, a guiding standard mounted thereon, a tool reciprocating mechanism slidably mounted on said standard, an engine on said base, driving connections betweensaid engine and tool reciprocating mechanism including a continuous belt connection, and mechanism comprising rotating elements driven directly by said belt connection for continuously rotating lthe tool.

7. In a drilling apparatus, a portable base,'

a guiding standard mounted thereon, a tool reciprocating mechanism slidably mounted on said standard, an engine on said base,

driving connections between said engine and tool reciprocating mechanism including a continuous belt connection, and mechanism driven by said belt connection for selectively rotating the tool at a pluralityl of predetermined speeds in the same direction..

8. In a drilling apparatus, a portable base, a guiding standard mounted thereon, a tool reciprocating mechanism slidably mounted on said standard, mechanism for feeding said tool reciprocating mechanism relative to said standard, an engine on said base, driving con! nections between sald engine and sa1d tool reciprocating mechanism and said feeding mechanism including a continuous belt conf nection, and mechanism driven by said belt connection for imparting continuous rotation to the tool.

9. In a drilling apparatus, a portable base, a guiding standard mounted thereon, a tool reciprocating mechanism slidably mounted on said standard, mechanism for feeding said tool reciprocating mechanism 'relative to said standard, an engine on said base, driving connections between said Lengine and said tool reciprocating mechanism and saidy feeding mechanism mcludmg a continuous belt connection, and mechanism driven by said belt connection for imparting continuous rotation to the tool selectively at a plurality of predetermined speeds. l

10. In a drllling apparatus, a portable base. v

base, a guiding standard mounted thereon, l

a tool actuating mechanism including a supportmg frame slidably mounted on said standard and a crank shaft carried by` said sliding frame, an engine on said base, and

driving connections between said engine and said tool actuating mechanism including a manually operable clutch on said crank shaft for disconnecting said crank shaft from said driving connections while the latter remain operative.

12. In a drilling apparatus, a portable base, a guiding standard mounted thereon, a tool actuating mechanism slidably mounted on said standard, an engine on said base,

driving connections between said engine and i said tool actuating "mechanism, mechanism dr1ven by sald engine for feeding said tool actuatmg mechanism relative to said stand.

ard, and a hoisting mechanism operativelyl connected to saiddriving connections for said feeding mechanlsm.

13. In a drilling apparatus, a portablev base, a guiding standard mounted thereon, a tool actuatmg mechanism slidably mounted on said standard, an engine on said base,-

driving connections between said engine and said tool actuating mechanism, mechanism driven by said engine for feeding said tool actuating mechanism relative to said standard, and a hoistingmechanism operatively connected to said driving connections for' said feeding mechanism including a hoisting drum and a friction controlling clutch and brake therefor.

14. In a drilling apparatus, a portable base having a power driving element thereon, a guiding frame mounted on said base, a frame slidably'mounted thereon, tool reciprocating mechanism carried by said sliding frame, driving connections between said power driving element and said tool reciprocating mechanism, and a plural speed p connec-l tions and carried by said sliding rame for mechanism driven by said drivin rotating the tool selectively at different predetermined speeds in the same direction. A 

